And karl oeorg frank



H. H. STICHT AND K. G. FRANK.

-ELECTIIICAL VIBRA'IOR, PARTICULARLY FOR IACHOMETERS. APPLICATION FILED MAR. 7, I919.

1,3 1 5 ,646 Patented Sept. 9, 1919.

2 SHEETSSHEET 2.

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LI N S: I II 1 ii 0 3 .LL I .II I I ZL- g I -3- II I i 7*; 3: 0 .55:, I I 4 I 8 I I l T a I a o -I R LE! Q r g 2"" WITNESSES I FLT? M w mns q%mm W g s'rATEs PATENT op nion.

HERMAN a. smear, or woonnavsn, New roux, AND KARI. shone smirk, or

WYOMING,

NEW JERSEY, ASSIGNORS T0 AMERICAI NT PRECISION WORKS, OF

NEW @ORK, N. Y., COBPOBA TION NEW YORK.

. I .1 n ELECTRICAL VIBRATOR, PARTICULARLY FOR TACHGMETERS.

To all whom it may concern: V

Be it known that we, H MAN H. Smear and KARL GEoRo FRANK, both citizens of the United States, and residents of Woodhaven Queens county, State of New York, and Wyoming, Essex'countmstate of New J e'r sey, respectively, have invented certaing new -.variations such as those of an alternating,

pulsating, or intermittent current are utilized to actuate reeds or vibrators provided in sets, the particular .reed whose rate of vibration corresponds to the frequency of such current variations, vibrating more strongly than the others and thus furnishin'g' an indication of such frequency. When this principlek-is utilized in a tachometer, V the. moving (rotary) part whose speed 1s to be; measured, is caused to produce the current variations which are measured by the reeds and which bear a definite relation to the speed of said moving part;

The object of our invention is to provide a very simple and eflicient device of the character indicated, and particularly to so construct the apparatus as to greatly. increase its range of action without increasing the number of reeds or vibrators.

' A specificexam'ple of our invention is illustrated in-the accompanying drawings,

in which Figure 1 vis an end view of a casin containing one section of a tachometer m bodying our improvements; Fig. 2 is'a section on'the line 2-2 of Fig. 5, showing another section of the device; F1 '3 is a horizontal section on line 3-3 0 Fig. 1; Fig. 4 is a 'crosssection on line H of Fig.

1, 2; Fig. 5 is a corresponding end view; Fig.

6 is a vertical section on line.6-6 of Fig. 8;

'- Fig. 7 is; a correspondingplan View; Fig.

8 isavertical section on llne 88 of Fig. 6; Fig. 9 is a perspective view showing a few of the vibrating reedsand the manner of,

supporting them; and Fig? 10 is a frontele vatlonof the electromagnet for vibrating the reeds. l a

The transverse bar 1 has 1ts ends secured to the centralportions of parallel support ing springs 2, the ends of which are fastened to a channel bar 3 attached to thebase or frame 4.- On one side, the bar 1 carries I Specification of Letters Patent.

r Application filed larch 7,1919. Serial No; 281,260.

"reed, the next 33%, the third 36%,

Patented Sept. 9, 1919.

' rigidlya number of blocks or sockets 5, to

which are secured the ends of" reeds or -vibrators-6, the other or free ends of which,

6', form pointers adapted to indicate on a normally stationary. scale, such as 7. For instance, there might be twenty-two (22) normal rate of 100 vibrations per second.

To the bar 1" is further secured-a piece 8 of magnetizable material, say a strip of soft spring steel adjacent to the pole pieces 9 of a stationary magnet '9, secured to the frame 4.. The strip 8 acts as an armature for the magnet 9, and should come close to, but not in contact with, the ole pieces "9. The springs 2 tend to hold t e bar 1 with the reeds 6 and'armature 8 in the normal each other anda-lso connected with the circuit, as will beset forth. below.

For a pur ose to be stated hereinafter, the scale 7 whi e normally stationary, may bemoved out of registry with the pointers 6' so as to enable another scale to be'brought into cooperation with said ointers. In the example illustrated, the see c 7 is on a cylindrical body or-member 11, having a 's'haft ll journaled in the frame or casing 4, the pro-. jecting end of-said shaft having aiknob or head 11? for adjusting it as desired. Thus,

instead of the scale 7 which is shown in opposition with the armature slightly away from the pole pieces 9. These pole pieces carry insulated wire coils 10, connected with Theshaft 11 also carries. rigidly a switch 12 adapted to engage stationary contacts 13 numbers of any one scale of the corresponding.

definite proportional relation to 'members 17 of insulating material, in

to the lo-- vmembers in each set secured to tlie frame 4" in suchpositions that every time the shaft is given a partial rotation to bring another scale into operative position, the switch 12 will be rouglrt against a different contact 13. If desired we may also provide 13' tobe engaged by the switch 12 in a position when none of the scales is in operative tudinal position and extent so that each of them may register properly with the raduation 1 and with the pointers 6'. or instance, one of the scales (7) may be numbered from '360'to 1200, the next (7) from 450 to 1500, the third (7" from 600 to 2000, the fourth (7) from the fifth (7) from 1800 to 6000; but in each case the numbers 01' each scale will bear a those of the other scales, and specifically,

.will be like multiples or submultiples numbers of a particular one ofthe other scales. Thus, in the example just given, taking the numbers of the last scale as the unit,

those of the fourth, third, second and first scales are respectively one-half, one-third, one-fourth and one-fifth ofthe numbers of such unit scale. Of course, we do not wish to restrict ourselves to this particular ratio of the several scales.

To enable this device to olution counter, we have ,rovided the following additional parts: lilach of the contacts 13 is connected, by a wire 14, to a conducting plunger or brush 15 mounted in a suitable portion A ofa housing A, and adapted to engage a' rotary interrupter cylinder 16, journaled in suitable bearings indicated at 16. The plungers or 15 are insulated from each other, and the cylinder surface engaged by their inner ends is of conducting material, but within said surface are provided interrupting'spotsfior operate as a revplanes of rotation corr ndin cation of-the brushes, so t at eac brush will engage only the interru ter memberor'members of its own set. e number of such will correspond inversely to the numerical ratio between the numbersof the several-scales on the cylinder 11. Thus, with the articular a ent of scales described a ve,'one of the rushes or plungers 15 would-have only one interrupter member 17 correspon y to it, there would be two members 17 in t, e plane of rotation corresponding to another brush-15, three members 17 inthe plane of rotation corresponding to a'third brush 15, four members 17 corresponding to a fourth brush, and

an idle or dead button 900 to 3000, and

all the:

brushes for supply lng the and coils 10, in any .one pole of said source 22 may fore with the switch responding to the fifth brush 15. The-members 17 of the same evenl on the circumference, of the cylinder 7 prings suchas 18 may be employed to press the brushes or plungers 15 toward the cylinder 16, the plungers in this case having a slidin fit in the housing ortion A.-

The s aft 16" is provide at one end ,with any suitable engaging device or attachment, such as a sleeve 19 held to turn with the {shaft and having a point 19' for axial engagement with the rotary art Be whose speed is to be measured. referably the shaft 16" and the c linder16 aremounted to move axially in the housin A, a spring 20 tending to project that en of the shaft which carries the point 19'. In this jected osition the opposite end of the s aft 16" wi lbe out of contact with a conducting plate or switch plate 21, so that normally there will be a gap in the circuit at thisint. The interrupter members 17 are so located that their planes of rotation will not containthe brushes 15 until the shaft 16f and cylinder 16 have been pushed back to bring the inner end of said shaft into contact with the switch plate'21. This lon tudinal' movement of the shaft 16" is 0 tained by the operators takin the housing A in his hand, bringingl the point 19' axially against the shaft or ot speed is to be measured, and pressing toward such part, so as to overcome the resistance of the'spring 20. V

The housing A is so formed that it may be held in the hand readily, while the frame or set would be spaced er rotary part whose casing 4 is in the nature of a portable'box which may be set readily on a floor, or other support. The connections between these two parts of the apparatus will be described presently. Y

At 22 we have indicated a source of electricity, say -dry cells ora stora e battery,

coils 10. 15 source of electricity is generally located within the casing 4". The magnet 9 may be a permanentmagnet, but at east the pole pieces 9 should be of soft iron. The source of electricity 22 is laced in circuit with the switch 12, cylin er 16 suitable manner so that whenever the circuit will flow through said coils. For instance,

the'shait 11' and there- 12; the other pole of said source 22 is represented as connected. by a wire 24, with one terminal of the coils 10, the other terminal of these coils being connected with the contact plate 21 by'a wire 25.

Preferably the by a. wire 23, with wires 14 and 25 are contained in an insulating sheath 26 common is .closed, the current.

be connected,

table, bench,

current to t e, magnet or six-conductor cable.

If an alternating, pulsating or intermittent current is sent through the coils 10, the pole pieces 9 will be magnetized per1odi-.

cally, attracting the armature 8 and causing it to. vibrate, together with the spring-supported carrying her 1, at a rate corresponc ing to the frequency or cycle of the currentwaves or interruptions.

are secured,but the particulanreed whose own normal rate of vibration "corresponds to said frequenc or cycle, will, owing to a resonance effect, vibrate much more strongly than the other reeds, and will thus give a visible indication from which, in connection with a proper scale on cylinder 11, the rate of vibration can be determined, thus enabling the apparatus to be used for measuring the frequency or cycle of current impulses.

When the apparatus is employed for measuring the speed of a moving part, say a rotary shaft, the point 19 1s brought against the end of such shaft axially, so

that the shaft will rotate the interrupter cylinder 16 and will be brought against The source of electricity 22 will be connected with the circuit by turning the'knob 11 until the cyltinder 16 brings to view, adjacent to the graduation i, that particular scale the range of which includes the speed to he de tel-mined (this speed will generally be known approximately). Bringingthispan ticularscale into operative positionalso insures contact between the switch 12 and the particular contact 13 which is related to saidscale and to the corresponc ing member oriset of members 17. That is to say, if'the scale bearing the numbers from 450 to 1500 is brought to operative position (the num bers of this scale being the numbers of the unit scale, divided by 4), this will cause the switch 12 to,engage thecontaot 13, the wire 14 of which leads to that plunger or brush 15 whiclris adapted to cooperate with the set contalning four members 17 .i If the unit, scale (with numbers from 1800 to 6000) is. brought into play, this automatically connects the switch 12 with theplunger or brush 15 adapted to engage a single member 17, and a correspondin relation is obtained whenever another sea e, is turned to the operative position.

The operation will be readily understood A's'the cylinder 16 rotates, all the plungers or brushes 15 are idle (electrically) except the one which atthat time is in electrical connection with the switch 12. Letus as:

Thereeds 6 share this vibration of the bar 1, to which they sume that the unit scale, indicating from '1800 to 6000 revolutions per minute, is in operative position. The switch'12 will rest on the contact 13 connected with the plunger 15 adapted to engage the single member 17.

will be sent through the-co1ls 10, cans ing the armature 8 to vibrate at this rate,

together with all the tongues 6, but the par-' ticular tongue or reed 6 whose own normal rate is 50 vibrations per second, will vibrate S5 much more strongly, and this particular tongue or reed will be opposite the number 3000 of the scale 7, thus indicatin that the shaft against which the point 19,, is being held, is rotating at 3000 revolutions per minute. i a

Now let us assume that the shaft whose speed 'is to be measured, is rotating at 1500 revolutions per minute. In this case, if we leave the parts in the same position as above (scale 7, the unit scale, inoperative position), none of the reeds 6 will respond by resonance, since 30 vibrations per second or 1800 per minute, isthe lowest number to which any of the reeds is tuned. Insuch a case 'theswitch 12 would be'shifted to the next contact 13, that is .to say, to the one 7 which is connected with the plunger or brush 15 cooperating with the set contain ing two anembers 17. Thus, two current impulses will be sent through the circuit including the coils 10, for each revolution of the shaft 16",or, in the case assumed (1500 revolutions) 3000 vibrations per minute will be imparted'to the armature 7 and bar 1 with the reeds 6, causing one of these reeds- (it happens to be, the same as before) to '1500, which is the correct indication of speed.

Similarly, in the case of still lower rotary speeds, the shaft 11 will be turned to bring other scales and the corresponding sets of members 17 into play, it being evident that at low speeds, we will use the sets of inter- 125" rupters 17-l1aving the greater number of members, so as tomultiply the number of electrical im ulses per revolutionof the iIiterrupter cy inder', and thus bring the num-,- ber of such impulses within the {range of flfl vention as set normal vibrations to which the tongues or reeds- 6 ,are tuned. It will, vtherefore, be understood that the range'of measurements obtainable with'this apparatus is greatly increased Jay the special construction of the We claim:

1. An apparatus ofthe character de-' scribed, comprising supportingsprings, a bar secured to said springs, an armature connected with said bar, an electro-magnet in operative relation to said armature, and

'a set of reeds connected with said bar and differing in their normal rates of vibration.

2. An apparatus of the character described, comprising parallel supporting springs, abar secured to said springs and extending transversely thereof, a set of reeds connected with said bar and differing in their normal rates of vibration, and an electromagnetic device for producing vibra tions, said device comprising two parts, viz. an armature and an electro-magnet, one of said parts being stationary, and the otherconnected With said bar.

3. An apparatus of the .character described, comprising supporting springs, a bar secured to said springs, a set of reeds connected with said bar and differing in their normal rates of vibration, and an electro-magnetic device for producing vibrations, said device comprising two parts, viz.

an armature and an electromagnet, one of said parts being stationary and the other connected with said bar. 7

4, An apparatus of the character described comprising a movably' supported bar, a set of parallel reeds connected with said bar and differing in their normal rates of-vibration, an armature likewise connected with said bar and parallel to said reeds, and an electro-magnet in operative relation to said armature.

. 5. An apparatus of the character described, comprising a set of reeds" differing in their normal rates of-vibration, a plurality of scales movable selectively into cooperative relation to said reeds, a rotary 1nterrupter; having as many sections as there are scales, and contact-makers cooperating with said sections, the several interrupter sections differing as to the number of times they will establish contact with the respective contact-makers during one revolution of the interrupter, vice for producing vibration of said reeds,

anelectrical circuitgincludin a source of ator, an

an electromagnetic deelectricity and said electro-magnetic device and also including a plurality of branches, one for each section of the interrupters, and a switch operatively connected with said scales and arranged to shift the current to the particular lnterrupter section corre sponding to the scale brought into operative positlon.

6. An apparatus of the character described, comprising a set of reeds differing in their normal rates of vibration, a plurality of scales movable selectively into e0 operative relation to said reeds, a rotary current-variator having as many sections as there are scales, and individual contactmakers cooperating with the several sec- .tions, said sections diiferin r as to the number of current-variations they will produce during one revolution of the current-varielectro-magnetic device for producing vibration of said reeds, an electrical circuit including a source of electricity and said electro-magn'etic device and also ineluding a plurality of branches, one for each section of the current-variator, and a switch operatively connected with said scales and arranged to shift the current to the particular current-varlator section which corresponds to the scale brought into operative position.

7 An apparatus of the character described, comprising a set of indicators responding totelectrical currents of different frequencies, a plurality of scales movable selectively into cooperative relation to said indicators, a movable current-variator having as many sections as there are scales, and individual contact-makers cooperatin with the several sections, said sections di ering as to the numberof current-variations they will produce during an equal travel of the current-variato'r, an electrical device for operating said indicators,an electrical circuit whichincludes a source of electricity and said'operating device and also includes a plurality of branches, one for each section of the current-variator, and a switch operatively connected with said scales and arranged to shift the current to the particular corresponds current-variator" section which to. the scale brought into 8. An apparatus of the character described, comprising a set of indicators responding to electrical currents of different frequencies, a plurality ,of scales movable selectively into cooperative relation to said indicators, a movable current-variator having as many sections as there are scales, and individual contact-makers coo crating with the several sections, said sections differing operative position.

as to the number of current-variations they,

will produce during an equal travel of the current-variator, an electrical device for operating said lndicators, an electrical circult which includes a source of electricity and current-variator,

said eratingdevice and also includes a plurality of branches, one for each section f the current variator, and a switch for" connecting said electrical operatingdevice selectively with the several sectibns of the 9. An apparatus cf .the character described, comprising a' set of indicators respending to electrical" currents of different .i'requ'encies, a plurality of scales movable selectively into cooperative relation to said indicators, a movable current-variator having as many sections as there are scales, and in dividual contact-makers co'dperatin Y with the several sections, said sections difiering as to the number of current-variations they avill produce during an equal travel'of the current-variator, an electrical devicefor operating said indicators, an electrical circuit which includes a source of electricity and said operating device and also includes, a plurality of branches, one for each section of the current'variator, and a switch forc0nnectingsaid electrical operating device se *corresponding to the s 0 current-variator.

lectively with the several sections of the current-variator, the numbers on the difierent' scales bearing to each other a ratio inverse to that of the number of current-variations everal sections of the 10. An apparatus of, the character described, comprising a set of indicators responding-to electrical currents of different, frequencies, a plurality of'scales movable selectively into coiiperative relation to said ing as many sections as there are scales, and

indicators, a movable current-variator havindividual contact-makers coiiperating with the several sections, said sections difi'ering as to the number of current-variations they will produce during an equal travel of the current-variator, an electrical device for operating said indicators, an electrical circult which includes a source of electricity and said operating device and also includes a plurality of branches; one for each section of the current-variator, and a switch operatively connected with said scales arid arranged tooshift the current to theparticular current-variator section which corresponds to the scale brought into operative position, the numbers 'on the diiferent scales bearing to each other aratio inverse to that of the number of current-variations correcurrent-variator;

spondingito the respective esectio'ns of the 11. An apparatus the character a described, comprising a set of indicators tuned to different frequencies, a plurality of scales movable selectively into cooperative relation to said indicators, a movable frequencyvariator having as many sections as there are scales,.said sections differing as to the num-' ber of,variations they will' produce during .an equal travel of said variator, a device for operating said indicators, operative connections between said device and the several sections of the frequency-variator, and a member operativelyconnected with, said scales and arranged to cennect'said operating device with the particular variator sec- .tion which corresponds to the scale brought into operative position. \12. An apparatus of the character described, com rising a set of indicators tuned todifl'erent requencies, a plurality of scales movable selectively into cooperative relation to said indicators, a movable frequency .variator having as many sections as there are scales, said sections differing vasto the number of variations the p a ing an equal travel of said variatorfa' device for operating said indicators, operative connections between said device and the several sections, of the frequency-variator, and a memberforfconnecting said operating device selectively with the several sections of the frequency-variator. a

y will produce durscribed,'compr1s1ng a set of indicators tuned to different frequencies, a plurality of scales -movable selectively into cooperative relation to said indicators, amovable frequencyvariator having as many sections as there are scales, said sections differing as to the number of variations they will produce during an equal travel of said variator, a device for operating Qsaid indicators, operative connections between said device and the several sections of the .frequency-variator, and a member for connecting said operating device selectively with the several sections of the frequency-variator, the numbers on the different scales bearing to each other a ratio inverse to that of the variations corresponding to the several section s-of the variator.

14. An apparatus of the] character described, comprising asset of indicatdrs tuned to difi'erent frequencies, a plurality of scales movable selectively into cooperative relation to said indicators, a movable frequencyvariator having as many sections as there are scales, saidsections differing as to the number of variations they will produce during an equal travel of said variator, a device for 1 operating said indicators, operative connections between said device and the'several sections of the frequency-variator, and a membe! .operatively connected with said scales and arranged to connect said operating dc; vice with the particular variator section which corresponds to the scale brought into operative position, the numbers on the diiferent scales bearing to each other a ratio inverse to that of the number of the variations corresponding to the respective sections of the variator;

15. An apparatus of the character de scribed, comprising a set of indicators tuned to difierent frequencies, a'movable member member and arranged h 17. An apparatus! of the scribed, comprising a set of indicators tuned provided with a plurality to be brought selectively into cooperative re lation to said indicators, a movable frequencygvariator having as many sections as there are scales, said sections differing as tothenumber of variations they willpro-- duce during an equal travel of said variator, a device for operating said indicators, and means for connecting said operating device selectively with the several sections of the variator.

16. An apparatus of the character described, comprising a set of indicators tuned to different frequencies, provided with a plurality of to be brought selectively into cooperative relation to said indicators, a movable frequency-variator having as many sections as there are scales, said sections differing as tothe number of variations they will produce during an equal travel of said variator, a device for operating said indicators, and means-operatively connected with said scaleto connect the said operating device with the particular variator section corresponding to the scale brought into operative position.

character deto different frequencies, a member arranged to turn adjacent to said indicators and provided with a plurality of scales adapted to be brought selectively into cooperative relation with said indicators, by turning said. member, a movable frequency-variator havas many sections as there are scales, said sections differing as to the number of variations they will produce during an equal travel of said variator, a device for operating said indicators, and means for connecting said operating device selectively with'the several sections of the variator.

18. An apparatus of the character described, comprising a set of indicators tuned. to different frequencies, a member arranged to turn adjacent to said indicators and provided with a plurality of scales adapted to be brought selectively into cooperative relation with said indicators, by turning said member, a movable frequencywariator having as many sections as there are scales, said sections difi'ering as to the number of variations they will produce during an equal travel of said variator, a device for operatof scales adapted I a movable memberscales adapted ing said indicators, and means operatively connected with said scale-member and ar ranged to'connect said operating device with I the particular variator section corresponding to sitlon.

' 19. An apparatus of the character do the scale brought into operative poscribed, comprising a set of reeds tuned to different frequencies, an eleetro magnetic device for operating said reeds, a rotary 1nterrupter and a source of electricity adapted to be in circuit with said device, said interrupter being adapted to be driven by a movable part and being also movable length wise of its axis to bring it into an operative to be in circuit with said device, said 1nterru ter being adapted to be driven by a mova le part and being also movable lengthwise of its axis to bring it into an operative or an inoperative position relatively to said circuit.

21. An apparatus of the character de' scribed, comprising a set of indicators tuned to different frequencies, a device for operating said indicators, a rotary variator adapted to be driven by a moving part and also adapted for operative connection with said device, said variator being movable lengthwise of its axis to bring it into an operative or an inoperative position relatively to such connection, and a spring for normally holding thevariator in such inoperative position.

22. An apparatus of the character de scribed, comprising a set of indicators tuned todifi'erent frequencies, a device for operatadapted to be driven by a moving part and also adapted for operative connection with said device, said variator being movable lengthwise of its axis to bring it into an terrupter and a source of electricity adapted v ring said indicators, and a rotary variator 

